package test.others;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;

import lombok.AllArgsConstructor;
import lombok.Data;

/**
 * 模拟RedisCluster的扩容 autoReshard
 * @author kangrui
 *
 */
public class RedisCluster {
	
	static int totalSlot = 32;//16384;
	
	private List<Server> servers = new ArrayList<>();
	private List<Slot> slots = new ArrayList<>();
	private Map<Integer, Server> slotServerMap = new HashMap<>(); //slotIndex<==>server
	
	public RedisCluster() {
		for(int i=0;i<totalSlot;i++) {
			slots.add(new Slot(i, new HashMap<>()));
		}
	}
	
	public void addServer(String ip) {
		int totalServer = servers.size() + 1;
		int perServerSlot = totalSlot / totalServer;
		
		Server addServer = new Server(ip, new TreeMap<>());
		int addServerSlot = 0;
		if(totalServer==1) {
			for(Slot slot : slots) {
				addServer.addSlot(slot);
			}
		} else {
			outer:for(;;) {
				for(Server server : servers) {
					Slot slot = server.getSlotMap().pollFirstEntry().getValue();
					addServer.addSlot(slot);
					if(++addServerSlot == perServerSlot) {
						break outer;
					}
				}
			}
		}
		servers.add(addServer);
		for(Server server : servers) {
			System.out.print("server[" + server.ip +"]\t");
			section(server.slotMap.keySet());
		}
		System.out.println("-----------------------addServer end--------------------------------");
	}
	
	public void add(String key, String value) {
		int hash = crc16(key);
		int index = hash % totalSlot;
		Server server = slotServerMap.get(index);
		Slot slot = server.getSlotMap().get(index);
		slot.entryMap.put(hash, new Entry(hash, key, value));
	}
	
	public String get(String key) {
		int hash = crc16(key);
		int index = hash % totalSlot;
		
		Server server = slotServerMap.get(index);
		Slot slot = server.getSlotMap().get(index);
		System.out.println("slotIndex=" + index + ", server=" + server.ip + ", slotEntryMap=" + slot.entryMap);
		return slot.getEntryMap().get(hash).value;
	}
	
	@AllArgsConstructor
	@Data
	private class Server {
		private String ip;
		private TreeMap<Integer, Slot> slotMap;//slotIndex<==>slot
		
		public void addSlot(Slot slot) {
			slotMap.put(slot.index, slot);
			slotServerMap.put(slot.index, this);
		}
	}
	
	//槽
	@AllArgsConstructor
	@Data
	static class Slot implements Comparable<Slot> {
		private int index;
		private Map<Integer, Entry> entryMap;
		@Override
		public int compareTo(Slot o) {
			return this.index - o.index;
		}
	}
	
	@AllArgsConstructor
	@Data
	static class Entry {
		private int hash;
		private String key;
		private String value;
	}
	
	@AllArgsConstructor
	@Data
	static class StartEnd {
		private int start;
		private int end;
		@Override
		public String toString() {
			return "[" + start + "~" + end +  "]";
		}
	}
	
	public static void main(String[] args) {
//		System.out.println(crc16("hello"));
//		
//		TreeMap<Integer, String> tm = new TreeMap<>();
//		tm.put(1, "1");
//		tm.put(2, "2");
//		tm.put(3, "3");
//		tm.put(4, "4");
//		tm.put(5, "5");
//		tm.put(6, "6");
//		
//		Map.Entry<Integer, String> entry = tm.pollFirstEntry();
//		System.out.println(entry);
//		System.out.println(tm);
		
		RedisCluster rc = new RedisCluster();
		rc.addServer("10.167.202.188");
		rc.addServer("10.167.202.193");
		rc.addServer("10.167.202.194");
		
		rc.add("hello", "world");
		rc.add("pk", "123");
		rc.add("lol", "bbq");
		rc.add("xiaoming", "name");
		rc.add("kkk", "haha");
		rc.add("biu", "hong");
		rc.add("blue", "heihei");
		rc.add("fuck", "xxx");
		rc.add("derf", "666");
		rc.add("heij", "hyiu");
		rc.add("liqi", "5454");
		rc.add("wwwq", "baidu");
		rc.add("360buy", "jd");
		rc.add("itougu", "zqt");
		rc.add("disappear", "diamond");
		rc.add("baolie", "2323");
		rc.add("13838383", "yyy");
		rc.add("8902384_888", "lis");
		rc.add("kate", "kyte");
		rc.add("amount1", "23");
		rc.add("amount2", "444");
		
		rc.get("hello");
		rc.get("pk");
		rc.get("lol");
		rc.get("xiaoming");
		rc.get("kkk");
		rc.get("biu");
		rc.get("blue");
		rc.get("fuck");
		rc.get("derf");
		rc.get("heij");
		rc.get("liqi");
		rc.get("wwwq");
		rc.get("360buy");
		rc.get("itougu");
		rc.get("disappear");
		rc.get("baolie");
		rc.get("13838383");
		rc.get("8902384_888");
		rc.get("kate");
		rc.get("amount1");
		rc.get("amount2");
		
		rc.addServer("10.167.202.60");
		rc.addServer("10.167.202.86");
		rc.addServer("10.167.202.98");
		
		rc.get("hello");
		rc.get("pk");
		rc.get("lol");
		rc.get("xiaoming");
		rc.get("kkk");
		rc.get("biu");
		rc.get("blue");
		rc.get("fuck");
		rc.get("derf");
		rc.get("heij");
		rc.get("liqi");
		rc.get("wwwq");
		rc.get("360buy");
		rc.get("itougu");
		rc.get("disappear");
		rc.get("baolie");
		rc.get("13838383");
		rc.get("8902384_888");
		rc.get("kate");
		rc.get("amount1");
		rc.get("amount2");
		
//		Set<Integer> set = ImmutableSet.of(4,7,1,3,9,8,0,2,12,13,19,17,18);
//		section(set);
		
	} 
	
	public static int crc16(String key) { 
		 
        int[] table = {
            0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
            0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
            0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
            0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
            0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
            0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
            0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
            0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
            0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
            0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
            0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
            0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
            0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
            0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
            0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
            0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
            0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
            0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
            0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
            0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
            0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
            0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
            0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
            0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
            0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
            0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
            0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
            0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
            0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
            0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
            0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
            0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040,
        };
        byte[] bytes = key.getBytes();
        int crc = 0x0000;
        for (byte b : bytes) {
            crc = (crc >>> 8) ^ table[(crc ^ b) & 0xff];
        }
//        System.out.println("CRC16 = " + Integer.toHexString(crc));
//        System.out.println(crc);
        return crc;
    }
	
	static void section(Set<Integer> set) {
		TreeSet<Integer> ts = new TreeSet<>();
		ts.addAll(set);
		
		List<StartEnd> list = new ArrayList<>();
		Integer start = ts.pollFirst();
		Integer temp = start;
		for(;;) {
			Integer num = ts.pollFirst();
			if(num==null) {
				list.add(new StartEnd(start, temp));
				break;
			}
			if(num - temp > 1) {
				list.add(new StartEnd(start, temp));
				start = num;
			}
			temp = num;
		}
		
		System.out.println(list + "===> total=" + set.size());
	}

}
